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IAUC 8122: C/2003 H1; C/2003 H2; 2003du

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IAUC number


                                                  Circular No. 8122
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET C/2003 H1 (LINEAR)
     An apparently asteroidal object reported by LINEAR (discovery
observation below), and posted on the NEO Confirmation Page, has
been reported to be cometary on Apr. 25 CCD frames taken by H.
Mikuz (Crni Vrh, 0.60-m reflector + R filter; strongly condensed
with coma diameter about 20" and m_1 = 15.9), P. Kusnirak
(Ondrejov, 0.65-m reflector; "seems to be slightly diffuse"), and
T. Spahr (Mount Hopkins, 1.2-m reflector; faint fan-shaped tail
about 5" long toward the south).

     2003 UT             R.A. (2000) Decl.        m2
     Apr. 24.38253   18 15 48.00   +19 55 25.3   16.9

Astrometry, very preliminary parabolic orbital elements (T = 2004
Mar. 5, q = 2.86 AU, i = 140 deg), and an ephemeris appear on MPEC
2003-H28.


COMET C/2003 H2 (LINEAR)
     Another apparently asteroidal object reported by LINEAR
(discovery observation below), and posted on the NEO Confirmation
Page, has also been reported to be cometary on CCD frames taken on
Apr. 25 by Mikuz (diffuse with condensation and coma diameter about
20"), M. Tichy (Klet, 1.06-m reflector; diffuse with faint tail in
p.a. 270 deg), and Kusnirak (coma diameter about 10").

     2003 UT             R.A. (2000) Decl.        m2
     Apr. 24.39543   18 27 01.22   +22 49 33.4   18.8

Astrometry, very preliminary parabolic orbital elements (T = 2003
May 4, q = 2.25 AU, i = 74 deg), and an ephemeris appear on MPEC
2003-H29.


SUPERNOVA 2003du IN UGC 9391
     R. Kotak and W. P. S. Meikle, Imperial College, London, on
behalf of the European Supernova Collaboration, report that a
spectrum (range about 500-760 nm) of SN 2003du (cf. IAUC 8121),
obtained at the Isaac Newton Telescope (+ IDS spectrograph) by P.
Rodriguez-Gil on Apr. 24.06 UT, shows the characteristic Si II 615-
nm absorption feature indicating that it is of type Ia.  Comparison
with the spectra of SN 2002bo indicates a phase of approximately 2
weeks before maximum light (-13 +/- 2 days).  The depths of the
features, relative to the continuum, appear somewhat more shallow
than in SN 2002bo.

                      (C) Copyright 2003 CBAT
2003 April 25                  (8122)            Daniel W. E. Green

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